Improvement in ratchet-drills



FFICE.

IMPROVEMENT IN RATCHET-DRILLS.

Specification forming part of Letters Patent No. 122,677, dated January9, 1872.

Speciiication describing anew and Improved Ratchet-Drill invented byJOHN J. SwrrzER, of Williamsburg, in the county of Kings and State ofNew York.

Figure l represents avertical transverse section of my improvedratchet-drill, the line C C, Fig. 2,indicating the plane of section.Fig. 2 is a longitudinal section of the same on the line K K, Fig. l.Figs. 3 and 4 are transverse sections on the lines C K and K C, Fig. 2,respectively.

Similar letters of reference indicate corresponding parts.

The invention will first be fully described, and then clearly pointedout in the claims.

A in the drawing represents the drill-stock or tube, conta-ining asocket, c, for the reception ofthe drill, and containing also thecenter77 B, which projects from its other end. The

center is a screw, entering the hollow stock A and grooved lengthwise toreceive the end of a pin, b, which projects inwardly from A, andprevents the screw from turning. The feed nut G is swiveled to the endof the tube A and is threaded to fit the screw b, so that by turningsaid nut the screw will be caused to slide in or out, but withoutturning. This feature of a sliding center I consider a valuableimprovement of the feeding device now in use,

handle D is provided with a succession of notches or depressions, f f,which constitute the ratchet-head. The spring pawl is contained withinthe handle and entirely connected with the saine. aperture, g, ofthe eyebefore the handle is applied to the tube A. The end of the pawl E is, bythe spi-in g 7L, forced against the ratchethead, and slips in thenotches ofthe same when the handle is turned in one direction, while,when the handle is turned in the other direction, it takes rm hold andturns the tube and drill with it.

The forming the ratchet-head in the body of the tube A by depressions isa great advantage over the usual method of forming projecting teeth. Itis stronger and-protects the bearing ing surface of each tooth at thesides, similar to a flanged ratchet-wheel, but is much cheaper to makethan the same. The forming the handle and eye in one piece and providinga chamber in the handle for the pawl and spring is also a moreeconomical and simple plan than any hitherto in use.

Having thus described my invention, I claim as new and desire to secureby Letters Patentl. An ordinary handle, D, provided with a spring-pawl,h E, combined with a tube, A, provided with nut d, shoulder c, andnotches f, to hold the tube and handle, as described.

2. A sliding feed-center, B, threaded and longitudinally grooved,combined in a ratchetdrill with a swiveled nut, O, a-nd tube A, havingpin b, as and for the purpose described.

JOHN J. SWITZER.

Witnesses:

A. V. BRIEsEN, T. B. MosHER.

It is introduced through an

